Microsoft Word - Preambles

GENERAL PREAMBLES

Introduction 1.1 The clauses in the General Preambles shall apply to all work items contained in the

Standard Schedule of Rates. 1.2 The Particular Preambles to each Trade shall be read in conjunction with the

respective Trade in the Standard Schedule of Rates. 1.3 All rates include the allowances for complying with the General and Particular

Preambles. 2 All rates contained in the Standard Schedule of Rates are fixed basic rates (in

Singapore Currency) and no amendment whatsoever shall be made to such rates. The tenderers shall be deemed to have closely studied all rates contained herein and duly noted their implications.

3 All rates contained in this Standard Schedule of Rates are exclusive of any Goods

and Services Tax. Any such Goods and Services Tax shall be borne by the Employer as and when the same becomes due and payable.

4 All work, materials and goods described in this Standard Schedule of Rates shall

be of the respective kinds described in the Contract and in accordance with the instructions of the Superintending Officer or the Superintending Officer's Representative.

5 Headings to groups of items shall be read as part of the descriptions of the items to

which the headings apply. 6 Where brand/trade names are given in the descriptions, they are solely intended

for fixing the rates of the items. The products and materials to be used in the Contract shall be governed by the Specifications, Drawings and other documents forming the Contract (and not this Schedule of Rates).

Description of Works and Inclusions 7 Unless specifically stated otherwise, the following shall be deemed to be included

in the description of the item of work:- (a) Labour and all costs in connection therewith including the labour in

fabricating, assembling, setting, fitting and fixing of materials and goods in position.

(b) Materials and goods including materials required for lapping, jointing and the

like and all costs in connection therewith such as delivery, unloading, storing, returning of packings, handling, hoisting and lowering.

(c) Preparing surfaces to receive work. (d) Protecting materials and work. (e) Waste of materials. (f) All cutting and waste.

GENERAL PREAMBLES

Description of Works and Inclusions (Cont'd) (g) Use of construction equipment, tools, vehicles and all costs in connection

therewith. (h) Cleaning up on completion and making good all work disturbed. (i) Establishment charges, overhead, profit and all forms of claims for loss and

expense. (j) General requirements set out in the Specifications, Drawings and other

documents forming the Contract. 8 Unless otherwise stated, all work shall be measured net as fixed in its place. 9 Unless otherwise stated, pipes are described by their internal diameters. 10 Where minimum deductions of voids are dealt with in this document they shall refer

only to openings or voids which are within the boundaries of measured area. Openings or voids which are at the boundaries of measured area shall always be the subject of deductions irrespective of size.

Billing of Quantities 11.1 Where the unit of measurement is the linear metre, square metre and cubic metre,

quantities shall be billed to the nearest whole unit. Fractions of the unit less than half shall be disregarded and all other fractions shall be regarded as a whole unit.

11.2 Where the unit of measurement is the kilogramme, quantities shall be billed to the

nearest whole unit. Fractions of a unit less than half shall be disregarded and all other fractions shall be regarded as a whole unit. Where the unit of billing is the tonne or litre, quantities shall be billed to the nearest two places of decimals.

11.3 Where the unit of measurement is the hour, fractions of the unit shall be billed to

the nearest next half hour. 11.4 Where the application of clauses 11.1 and 11.2 would cause an entire item to be

eliminated, such item shall be billed to the nearest two places of decimals. 12 Where rates with descriptions pertain to the same purpose are listed in more than

one Standard Schedule of Rates incorporated in the Contract; the rate as listed in the following schedules (in the stated order of precedence) shall prevail :- 1

st Precedence - Standard Schedule of Rates for Building Works

2nd

Precedence - Standard Schedule of Rates for Civil Engineering Works 3

rd Precedence - Standard Schedule of Rates for Electrical Works

13 Unless otherwise stated, the term "as specified" means as specified in any of the

documents forming part of the Contract.

GENERAL PREAMBLES

Description of Works and Inclusions (Cont'd) Billing of Quantities (cont’d) 14 The following abbreviations are used for the units:-

m - Linear metre m2 - Square metre m3 - Cubic metre no - Number kg - Kilogram ton - Tonne pr - Pair sht - Sheet ltr - Litre hr - Hour

PARTICULAR PREAMBLES TO VARIOUS TRADES

1.0 EXCAVATION Definition of Ground 1.1 Ordinary ground:- includes spoil or rubbish of every description, rubbish tip material

etc, sand gravel, decomposed granite, red or white earth, loamy or gravelly clay, gravelly laterite, mud, bog or any other formation of pick and shovel and at any depth.

Description 1.2 The description of each item of excavation shall be deemed to include excavating

around foundation, piles and confined areas, getting out, removing of bakau piles, trimming, levelling and compacting bottoms of excavations, keeping sides plumb and planking and strutting.

Measurement 1.3.1 The measurement of all excavations and subsequent disposal shall be those

before excavating. The increases in bulk and any extra excavation required for earthwork support, planking and strutting and formwork for concrete shall be deemed to be included in the rates.

1.3.2 No allowance for working space shall be made in the measurement of all

excavation unless the method of construction requires workmen to operate from the outside of the structure. In such cases, a working space of 600mm shall be measured from the external face of the structure.

1.3.3 Filling shall be measured as equal to the void to be filled. Any thickness stated

shall be deemed to be after compacting. Rate 1.4 Rates for each item shall be held to include for keeping all excavation free from

water and site dry, pumping or bailing if required and providing any temporary drains required.

Pre-Treatment of Soil against Subterranean Termites 1.5.1 Soil treatment shall be measured flat on plan and the method of measurement

shall be up to the perimeter of the building line (excluding the apron areas). Link buildings, linkways and other structures shall also be similarly measured.

1.5.2 No deduction shall be made in the measurement for plan areas occupied by the

column stumps. 1.5.3 The rates indicated shall be inclusive of the provision of Warranty (10-year

warranty for using Chlordane and 5-year warranty for using Chlorpyrifos) and shall not in any way affect the provisions of Building Specifications on Pre-Treatment of Soil for Protection of Buildings Against Subterranean Termites which provisions remain applicable in every respect in relation to all situations where these rates are applied.


2.0 CONCRETE WORK Rate 2.1 Rates for each item of concrete shall be held to include the following :- (a) Forming, cutting grooves, chases, mortices, holes and making good any

other sundry items of a like nature. (b) Extra labour for laying to falls, or cambers and preparing surfaces to receive

screeds or pavings also to be included. (c) All tests on concrete, cement and aggregate etc, as required and compliance

with the strengths as specified. (d) Tamping and/or vibrating to give thorough compaction; working between and

around reinforcements. (e) Laying on any type of sub-base; preparing and leaving surfaces to receive

screeds or paving. Deduction 2.2 No deduction shall be made in the measurement of concrete work for :-

(a) Voids of 0.05 cubic metre or less.

(b) Volume of the reinforcement and steelwork.

(c) Openings in walls, floor, roof slabs and the like of 0.10 square metre or less.

(d) Tamping and/or vibrating to give thorough compaction; working between and around reinforcements.

(e) Laying on any type of sub-base; preparing and leaving surfaces to receive

screeds or paving. 2.3 Reinforcement Description 2.3.1 The description of each item of reinforcement shall be deemed to include:-

(a) Allowances in the weight of reinforcement for rolling margins.

(b) All cleaning, cutting, bending, fabricating, placing, tying and the provision of all necessary distance blocks, tying wires, spacers or chairs, temporary fixings and supports.


2.0 CONCRETE WORK (CONT’D) Measurement 2.3.2 The conversion factor for the various steel reinforcement bars shall be as follows :-

6mm diameter - 0.222 kg/m 7mm diameter - 0.302 kg/m 8mm diameter - 0.394 kg/m 9mm diameter - 0.499 kg/m 10mm diameter - 0.616 kg/m 13mm diameter - 1.042 kg/m 16mm diameter - 1.579 kg/m 20mm diameter - 2.466 kg/m 22mm diameter - 2.984 kg/m 25mm diameter - 3.854 kg/m 28mm diameter - 4.834 kg/m 32mm diameter - 6.313 kg/m

2.4 Fabric Reinforcement 2.4.1 Rates for each item of fabric reinforcement shall be held to include for extra

material at laps, tying wires and all bending, cutting and notching around obstruction. Only the net area covered shall be measured and no deduction shall be made for opening less than 1.00 square metre.

2.5 Beam Cage Reinforcement 2.5.1 Rates for each item of cage reinforcement shall be held to include for extra material at laps. 2.5.2 The area of Beam Stirrup Cage Reinforcement shall be the product of the

perimeter of stirrup multiplied by the length of the Cage. 2.5.3 The area of Beam Capping Cage Reinforcement shall be the product of the

perimeter of the Cage multipled by the length of the Cage. 2.5.4 The area for prefabricated pilecap mesh reinforcement shall be based on the

bottom flat area of the mesh reinforcement without considering the upward projecting bars.

2.5.5 The area for dowel mesh reinforcement shall be the product of the length and

breadth which includes the depth of the bend.


2.0 CONCRETE WORK (CONT’D) 2.6 Formwork Description 2.6.1 The description of each item of formwork shall be deemed to include :- (a) All necessary boardings, supports, erecting, framing, cutting, perforations for

pipes, angles, cleaning, wetting and treatment with mould oil, mould liquid or limewhite and the like.

(b) All splayed edges, notchings, allowance for overlaps and passings at angles,

battens, strutting, bolting, wedging, easing, striking and removal. Measurement 2.6.2 Formwork shall be measured to the surface of work sloping more than 15 degree

from the horizontal. Deduction 2.6.3 No deduction shall be made in measurement of formwork for :- (a) Openings less than 1 square metre. (b) Intersection of main and secondary beams. (c) Intersection of beams and stanchion casing or columns. 2.7 Unless otherwise stated, rates for concrete, reinforcement and formwork shall be

applicable to all work irrespective of locality, positions, shapes and height. 2.8 Precast Work Description 2.8.1 The description of each item of precast work shall be deemed to include concrete,

reinforcement, formwork including the formation and filling of pockets, holes, chases and recesses for anchors, bolts and the like, grouting, pointing of joints, surface finishes, delivery , unloading, hoisting, erecting, fixing including all necessary temporary erection gear, bracing and working platforms.

2.9 Precast Concrete Vent Measurement 2.9.1 The measurement of precast concrete vents shall be taken by volumes without

deduction of voids.


2.0 CONCRETE WORK (CONT’D) 2.10 Piling Work 2.10.1 Piling work shall be executed in accordance with the relevant Specifications and

the instructions of Superintending Officer's Representative. Description 2.10.2 The description of each type of piling work shall be deemed to include removal of

underground obstructions together with all work in connection therewith unless specifically otherwise provided.

2.10.3 The description of each type of piling work shall be deemed to include extending

piles, dollying and connections unless specifically otherwise provided. 2.10.4 Redriving or intermittent driving necessitated by lengthening or upheaving of piles

or by the removal of obstructions under piles or other causes including moving and repositioning the piling frame shall be deemed to be included with the items of piling.

Rate 2.10.5 The rate of each item of piling shall be deemed to include :- (a) Handling, pitching, heading, pointing and bracing and providing protective

wrought iron ring or helmet to pile. (b) Cutting off surplus and heads of piles, preparing and integrating

reinforcement into pile caps where applicable, extra excavation, backfilling and disposal of debris.

(c) Disposing of materials displaced arising out of driving the piles. 2.10.6 The rate of each item of treated timber piles includes the applicable of wood

preservative to cut off surfaces of piles. 2.10.7 The rate of each item of reinforced concrete piles includes moulds, reinforcement,

preparing heads and extra labour and materials to receive pile extensions. 2.10.8 The rate of each item of pile tests includes provision of all anchors, platforms,

loading and unloading of materials, instruments and monitoring of the tests. 2.10.9 Movement of piling frames into position and about the site, any necessary

excavation or filling required to place the frames, raising or lowering the frames and any staging, barges or the like required to support the frames, shall be deemed to be included with the item of piling.


2.0 CONCRETE WORK (CONT’D) Measurement 2.10.10 Payment for treated timber piles driven shall be the product of the relevant rate per

metre run and the penetration depth (measured from tip to cut-off level). 2.10.11 The pay length of each reinforced concrete pile after it is driven into the ground is

measured from the cut-off level of the pile to the end of pile shoe. Notwithstanding the provisions of Billing of Quantities contained in the General Preambles, the pay length of reinforced concrete piles shall be billed to the accuracy of nearest of 10mm.

2.11 Surface Water Channels Rate 2.11.1 Rates for each item surface water channels shall be held to include for all angles,

intersections, ends, outlets and extra labour and material for forming grooves or rebates to sides.

Measurement 2.11.2 Where an item is described as “Add to last item for the increase in stages of

150mm deep”, the difference of any depth less then 150mm shall be paid based on 150mm depth.

3.0 FLOOR FINISHES Description 3.1 The description of each item of floor finishes shall be deemed to include all

temporary rules, temporary grounds, temporary screeds and the like, cutting holes, notching and the like, all normal bedding and pointing materials, providing all necessary samples, cleaning down and making good around pipes, sanitary fixtures and the like, work in narrow widths and small quantities in areas interrupted by seatings, channel and the like, all internal angles, quirks, grooves, throats, drips, coves and rounded external angles not exceeding 25mm radius, angles, stops, intersections, fair ends junctions, wreathed corners and the like on cornices, mouldings, enrichments, coves, skirtings, gutters, channels, strings, kerbs and similar or other sundry items of a like nature.

3.2 The description of each item of floor finishes shall be deemed to include protecting

surfaces from the weather or building operations. Rate 3.3 Unless otherwise stated, rates in this section are applicable to works at horizontal

surfaces exceeding 300mm wide.


3.0 FLOOR FINISHES (CONT’D) 3.4 The rates for skirtings, shall be applicable to the following :-

(a) Drops, risers, sides of plinths and curbs and other vertical surfaces not exceeding 300mm high.

(b) Treads, top of curbs and other horizontal surfaces not exceeding 300mm wide. Deduction 3.5 No deduction shall be made for openings of 0.50 square metre or less. Measurement 3.6 Where an item is described as "Add to (or deduct from)…… for each 5mm

thickness over (or under)…..", the difference for any thickness less than 5mm shall be paid/deducted based on 5mm thick.

4.0 ROOFING Description 4.1 The description of each item of roofing shall be deemed to include :- (a) All laps, straight, skew and circular cutting at eaves, verges, top edges,

abutments, valleys and hips, cutting holes for pipes, nails, screws, clips, pellets, straps and the like.

(b) Chasing the structure for burning-in or tucking in edges of coverings, flashing

and the like. (c) Holes in coverings, underbeds and insulations for pipes, standards and the

like and making good. Deduction 4.2 No deduction shall be made for voids of 0.50 square metre or less. 4.3 Membranes System and Panel Roofing System Rate 4.3.1 Rates for Waterproofing Membranes System and Panel Roofing System shall be

held to include for narrow widths, small quantities, temporary rules, covering up, protecting after laying and cleaning on completion, all labour to form arises, fair edges etc., all cuttings and working around pipes, dress down at eaves to form drips or carried up at abutments to walls, pipes, parapets, skirtings, concrete curbs, etc. and the like.


4.0 ROOFING (CONT’D) 4.4 Profiled Sheet Roofing Description 4.4.1 The Description of each item of profiled sheet roofing or cladding shall be deemed

to include all cutting at square and raking abutments, top edges, bedding and pointing eaves fillers, verges, cutting and fitting and making good around outlets, pipes and any other sundry items of a like nature.

5.0 CARPENTRY AND JOINERY Description 5.1 The description of each item of carpentry work shall be deemed to include all

cutting, notching, boring, sinking, pelleting, fitting, trimming, mitring, halving, morticing, tenoning, dovetailing, scarfing, wedging and all ends, splayed edges, short lengths and temporary supports and any other sundry of a like nature and also all labour in forming, drilling for bolts and fixing in position complete with nails, screws or adhesives.

5.2 The description of each item of joinery work shall be deemed to include all nailing,

gluing, screwing, plugging, cutting, notching, holes, housing ends, mitring ends and shaped ends, angles, junctions, heading joints, short lengths, tongued angles, splayed or rounded edges, chamfers, rebates, grooves and any other sundry items of a like nature including stops and working cross-grain, fitting and hanging and the like.

5.3 Nominal sizes are stated for wrot timber and an allowance of 2.5mm is permitted

for each wrot face. 5.4 Rates for windows and doors include hanging and fixing. 5.5 Where ironmongery is included in the description of doors, it shall be deemed to

include hinges, floor springs, door gears, locks, latches, catches, bolts, closers, holders, padlocks, stoppers, push-bars and plates, pull bars and handles, kickplates, locking eyes and the like as specified.

6.0 IRONMONGERY Rate 6.1 Rates for each item shall be held to include for supply, delivery to site and fixing

complete with all matching screws of the same finish as ironmongery, nails, pins or brads, cutting, sinking and boring and morticing as required, oiling and easing and adjusting all moving parts, taking off and refixing after painting where necessary and handing 3 keys properly labelled to the Superintending Officer or the Superintending Officer's Representative etc unless otherwise described.


7.0 STEEL AND IRON WORK 7.1 Steel Work Description 7.1.1 The description of each item of steel work shall be deemed to include :- (a) Allowances for rolling margins and the weight of welding materials. (b) Shop and site fabrication including drilling, cutting (including holes and

openings for other trades), notching, splicing, riveting, bolting, machining ends and bearings, delivery, unloading, landing, hoisting, erecting, fitting and fixing in position.

(c) Provision of all necessary construction equipment, temporary bracing

supports and the like required for erection, providing samples and tests required by the specification, the inspection of welds including the use of any special radio-graphic techniques.

(d) Nuts and any type of washer which may be required. (e) Preparation of shop drawings. Deduction 7.1.2 No deduction shall be made for drillings, holes, notchings, splay cuts and the like. Measurement 7.1.3 Weights stated shall be net theoretical weights. 7.1.4 Steel sections and plates in connections or fitted stiffeners, column cap and base

plates, rigid frame bases and butt plates, purlins, girts, eaves, fascias and similar cleats or brackets attached to trusses, lattice girders and open web joists and plates, including chequered plates in landings, treads and risers and similar items shall be weighted at net dimensions.

7.1.5 Irregular, including circular shaped plates shall be weighted at the smallest size

rectangles from which they can be cut; regular and triangular shaped plates shall be weighted at net dimensions.

7.1.6 Half or other parts of steel sections in connections shall be weighted at half the

weight of the section from which they have been cut when equal to or less than half the section and at the full weight of the section from which they have been cut when greater than half the section.


7.0 STEEL AND IRON WORK (CONT'D) 7.2 Metal Work Description 7.2.1 The description of each item of metal work shall be deemed to include :- (a) Allowances for rolling margins and the weight of welding materials. (b) Cutting, notching, mitring, welding, riveting, bolting, fabricating, drilling,

delivery, unloading, handling, assembling, hoisting, fitting and fixing in position, bedding, filling in solid, polishing and pointing including necessary lugs or other attachments.

(c) Protection such as wrapping finished work with paper, coating with grease or

carrying out such other protective measures as may be required and removing and cleaning on completion.

(d) Providing samples and testing as required. (e) Preparation of shop drawings. Deduction 7.2.2 Weights stated shall be net theoretical weights. No deduction shall be made for

notches, holes and the like.


8.0 WALL AND CEILING FINISHES Rate 8.1 Rates for each item shall be deemed to include the provision of keys to receive

finishes, all temporary rules, temporary grounds, temporary screeds and the like, cramps, dowels, ties, special metal supporting brackets and the like, cutting holes, notching and the like, masking, labour to internal angles other than coved angles, making good around pipes, sanitary fixtures and the like, work in narrow widths and small quantities, joints between different types of work, joints between new and old work, internal angles, fair edges, rounded or chamfered edges or angles, quirks, grooves, V-joints, groin points and other intersections of curved surfaces, rounded coves and external angles not exceeding 25mm radius, necessary UPVC trimming pieces, mitres, stops and the like on cornices, mouldings, architraves, coves, skirtings, gutters, strings and all making good and any other sundry items of a like nature.

8.2 Rates for each item shall also be deemed to include protecting surfaces from the

weather or building operations. 8.3 Rates for each item of wall tiling shall be held to include for narrow widths and

small quantities and fittings around air bricks, pipes and the like and any other sundry items.

8.4 Rates for each item of terrazzo shall be held to include for narrow widths and small

quantities, and for all temporary rules, internal angles, arises, joints between different types of terrazzo, quirks and all making good and any other sundry items of a like nature on in-situ terrazzo, fitting around air bricks, pipes and the like and any other sundry items of a like nature on precast terrazzo.

Deduction 8.5 No deduction shall be made for openings of 0.50 square metre or less. Measurement 8.6 In the measurement of plastering, no deduction shall be made for casings for pipes

under 300mm wide or angles which are finished in a different material if these do not exceed 100mm girth.

8.7 "Within the building" shall mean surfaces within the internal of buildings/flats,

corridors, staircases and the like which normally do not entail scaffolding or mechanical cradles to carry out the works.

8.8 "External face of building" shall mean surfaces such as gable end walls, front/back

external walls and any other surfaces which are constantly exposed to weather and/or which normally require the use of scaffolding or mechanical cradles to carry out the work.

8.9 Work shall be deemed to be executed when scaffolding has been provided during

the course of construction. Should scaffolding be required separately just to execute the work, it would be paid as an extra item.


9.0 SANITARY, WATER AND GAS INSTALLATION Description 9.1 The description of each item of pipework shall be deemed to include :- (a) All short lengths, joints in the running lengths, joints to all branches, tees,

sockets, sleeves, connectors, backnuts, nipples, standard pipe framings or supporting clips, saddles, fastening brackets, holderbats, straps and the like.

(b) Giving notices. (c) Complying with all requirements of the relevant authorities, paying fees and

the like in connection with the installations and preparing and submitting drawings for approval if required.

10.0 PAINTING AND DECORATING Rate 10.1 Rates for each item of painting shall be held to include for all necessary

preparation of surfaces including cleaning off, sandpapering woodwork, wirebrushing metal and leaving all surfaces free from dust, rust, grease and oil before painting, narrow widths, etc.

10.2 All items in this section shall be deemed to include for multi coloured works. Deduction 10.3 No deduction shall be made for openings of 0.50m2 or less. 10.4 Work shall be deemed to be executed when scaffolding has been provided during

the course of construction. Should scaffolding be required separately just to execute the work, it would be paid as an extra item.


11.0 TURFING AND TREE PLANTING & LANDSCAPING WORKS Definition of Approved Soil Mixture 11.1 Approved soil mixture shall be 3:1 topsoil, soil conditioner and 1 kg per m

3 of

granular fertiliser NPK (15:15:6:4) or 4:2:1 subsoil, unwashed sand and soil conditioner with 1 kg per m

3 of granular fertiliser NPK (15:15:6:4) for within water

catchment areas and 3:1 topsoil, dried sludge mix or with a well mixed 4:2:1 subsoil, unwashed sand and sludge mixture for outside water catchment areas.

Measurement 11.2 The measurement of girths of the trees shall be at a height of 1.0 metre above ground. 11.3 Rates

The rates for cutting down trees shall be deemed to include for grubbing up roots and filling of voids after removal of tree roots.

11.4 The rate of each item of turfing and planting shall be deemed to include for

watering, weeding, fertilizing, cutting, settlement, re-seeding and maintenance during the "Maintenance Period" as specified.

12.0 DAYWORK Rate 12.1 Rates shall be applicable in respect of all work executed on a daywork basis.

During the continuance of such work, the Contractor shall keep proper records of the names, occupations and working hours of all workmen employed for such work and the quantities and descriptions of all materials and construction equipment employed. Such records, receipts or vouchers must be verified by the Superintending Officer or the Superintending Officer's Representative before payment can be effected.

Microsoft Word - Preambles

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